The Companions questline is how you gain lycanthropy.  The option to cure yourself of lycanthropy becomes available after you complete the entire questline.  "Glory of the Dead" is the final quest in the Companions questline.  This quest involves going into Ysgramor's Tomb, fighting previous Companion's ghosts, and throwing a Glenmoril Witch head on the flame to free Kodlak's wolf spirit, which you will have to fight.  After this quest, you can cure yourself of lycanthropy.  After completing Glory of the Dead, you have the option to cure yourself of lycanthropy before exiting Ysgramor's Tomb.  Simply throw another Glenmoril Witch head on the flame to release your own wolf spirit, which you will have to fight. Once you are cured of lycanthropy, you will not be able to complete the Totems of Hircine quest, which grants a unique ability you can use while in wolf-form.  You will also lose access to the Underforge. Both can be found in their quarters, which are located in the basement floor of Jorrvaskr.  It's the large round building next to the castle in Whiterun. You will need to do a few random tasks for both Farkas and Vilkas.  Much of it is repeating the same missions you already completed.  Take the missions and complete them. While doing work quests for Farkas and Vilkas, they will eventually reveal that they want to make the same choice that Kodlak did, and cure themselves of their lycanthropy. Offer to help them.  This will activate the Purity quest. If you already have a Glenmoril witch head in your inventory leftover from the Blood's Honor quest, they will urge you on to Ysgramor's Tomb (skip to the next step); otherwise, they will offer to help you get one.  Fast travel to the Glenmoril Coven. After completing the “Blood's Honor” quest, it should be an accessible location on the world map. It is located northwest of Falkreath. Enter the coven and you will find five Glenmoril witches there. Kill them and loot their bodies to gather at least three heads (one for both Farkas and Vilkas, and one for you). Journey to Ysgramor's tomb with the quest giver. You can either fast travel there or follow the active quest marker on your compass. Ysgramor's tomb is in the far northern region of Skyrim; the major hold that it is nearest to is Winterhold, whose icon on the map looks like a 3-pointed crown within a shield.  To reach Ysgramor's Tomb from Winterhold, head north and pass over the water. The tomb is located right on the bank of a small island. To reach Ysgramor's Tomb from Whiterun is a much longer journey. The tomb is located northeast of Whiterun. After exiting Whiterun, go past the town walls in the north and continue heading north. You will pass many mountains along the way, but do not stop until you reach Dawnstar. After reaching Dawnstar, head northeast and cross the water to reach the banks of the island where the tomb is located. Open the doors to the tomb and descend the stone steps. Head straight past the torches until you reach the set of wooden spiral stairs leading down further into the tomb.  Then descend the stairs, which will lead you to a large open room with a blue flame called the Flame of the Harbinger burning in the center. Approach the Flame of the Harbinger and activate it with the appropriate button prompt on the screen. After activating the flame, a spectral wolf will leap out from the altar and begin attacking you. Defeat it to cleanse your quest giver of his lycanthropy.  The spirit behaves like a wolf you might run into in the wild; simply keep it at a distance by casting fireball spells or using arrows to easily bring it down. This wolf is not a particularly difficult enemy. It's most challenging feature is it's speed, hence the need to keep a distance. However, if you favor close combat, heavy hitters will quickly be able to kill the wolf with a few swings of a war hammer. After defeating the wolf, you will be prompted to talk to your quest giver. He'll ask if it's over, and explain how he feels like a proper warrior now. After talking to your quest giver, the Purity radiant quest will be marked as completed. After you cure Farkas or Vilkas, you will need to cure the other.  Talk to the other brother and repeat steps 2 through 10 to complete the Purity quest again and cure the second brother.  Once both are cured, you can cure yourself. Approach the flame, and activate it again by pressing the button displayed on the screen. A text box will appear asking, “Cast the witch's head into the flames to cure your lycanthropy forever” Select Yes.   Another wolf spirit will emerge from the flame, which you must vanquish to cure yourself. Use the same methods for killing this wolf as you killed the first one. Once you have defeated the wolf, you will be cured of your lycanthropy.  Note: Curing lycanthropy is a permanent decision.  You will lose access to the Underforge, you will not be able to complete the Totems of Hircine or Visit the hunters at Frostmoon Crag quests.
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One-sentence summary -- Complete the Companions questline. Talk to Farkas or Vilkas. Ask for work. Accept the Purity mission. Get a Glenmoril witch head. Travel back to Ysgramor's Tomb. Enter the tomb. Activate the flame. Kill the wolf spirit. Talk to the quest giver (Farkas or Vilkas). Cure the other brother. Cure yourself of lycanthropy.

Article: Worship Him and praise Him for His attributes. Read God's Word, and meditate that God will lend me His Wisdom, so that I can input His Word into my life, and I can gain a fuller understanding of it. Pray for God's Will to be done, and for the guidance of the Holy Spirit. Ask God to lead you in spreading His Glory into the world we live in. Walk outside, hand in hand with nature, while noticing God's wondrous creation. Thank Him for everything He has created as you walk. Ask Him to give you a spirit of thanksgiving and appreciation. Pray for church leaders to preach His Word as God intended, so that your friends and family members will grow closer to Him or accept Him into their lives; pray for government leaders to come to Him, and ask Him for His Will.
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Hold morning worship. Go for a prayer walk. Pray for the welfare of others.